Assessing Water Ecological Security in the Taihu Lake Basin through Ecological Function Localization

doi:10.16258/j.cnki.1674-5906.2024.03.010

Ecology and Environment ›› 2024, Vol. 33 ›› Issue (3): 418-427.DOI: 10.16258/j.cnki.1674-5906.2024.03.010

• Research Article [Environmental Sciences] • Previous Articles Next Articles

Assessing Water Ecological Security in the Taihu Lake Basin through Ecological Function Localization

LING Hong¹^,²^,³(), ZHU Xiaoxiao¹^,²^,³^,^*(), WU Dan⁴, SU Xiaomei⁴, GUO Xiya¹^,²^,³

1. Jiangsu Provincial Environmental Engineering Technology Co., Ltd., Nanjing 210000, P. R. China
2. Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Industry and Information Technology, Nanjing 210000, P. R. China
3. Jiangsu Environmental Protection Group Co., Ltd., Nanjing 210036, P. R. China
4. Jiangsu Academy of Environmental Science, Nanjing 210036, P. R. China

Received:2023-11-19 Online:2024-03-18 Published:2024-05-08
Contact: ZHU Xiaoxiao

基于生态功能定位的太湖流域水生态安全评估

凌虹¹^,²^,³(), 朱晓晓¹^,²^,³^,^*(), 巫丹⁴, 苏小妹⁴, 郭西亚¹^,²^,³

1.江苏省环境工程技术有限公司，江苏南京210000
2.污染环境修复与生态健康工业和信息化部重点实验室，江苏南京 210000
3.江苏省环保集团有限公司，江苏南京 210036
4.江苏省环境科学研究院，江苏南京 210036

通讯作者: 朱晓晓
作者简介:凌虹（1975年生），女，研究员级高级工程师，博士，主要从事环境规划及环境管理政策研究。E-mail: 503769747@qq.com
基金资助:
江苏省太湖治理科研课题(TH2018402);江苏省环保集团科技项目计划(JSEP-GJ2023-1005-RE-ZL)

Abstract

Abstract:

The aquatic ecological security of Taihu Lake Basin is crucial for maintaining the overall ecological balance in the Yangtze River Basin. This study aimed to assess the aquatic ecological security of Taihu Lake Basin by considering various ecological functions. This study combined the aquatic ecological function zones of Taihu Basin with the dominant ecological function positions in different regions. The assessment used the “Stress-Status-Service” (PSS) model based on dominant ecological function positioning. The results indicated the ecological security of the Taihu Lake Basin to be mainly “relatively safe” and “basically safe,” with the habitat state of the Taihu Lake being the most compromised. Habitat pressure and state have been identified as the main restrictive factors for aquatic purification, water source conservation, aquatic environmental maintenance, and important habitat maintenance areas. Specifically, zones II-08, II-10, and III-20 of Taihu Lake were deemed “unsafe,” largely attributed to the pollution loads from the inflow rivers. Human activities have significantly affected the maintenance of aquatic environments and important habitat maintenance areas. Correlations between nitrogen (N) and phosphorus (P) concentrations in the lake and water bodies as well as in the sediment of the inflow rivers were observed. Water quality in zones II-03, III-11, and III-12 was significantly related to N and P concentrations in the III-20 zone. In addition, the proportion of river channels significantly correlated with total nitrogen (TN) and total phosphorus (TP) concentrations of 50% and 66.7%, respectively (P>0.05). Therefore, the influence of N and P inputs must be considered. The rivers located in III-13 and Zhejiang Province had 100% and 71.4% inflows, respectively, and their TP concentrations were significantly correlated with the TP concentration of Taihu Lake (P>0.05). The risk of exogenous pollution caused by TP was significant, thus emphasizing the need for control. The concentrations of N and P in the sediments of the inflow rivers were higher. Sediment resuspension resulted in the release of pollutants, such as N and P, into the overlying water and then into Taihu Lake, affecting its aquatic ecological security. Attention should be paid to treating TN and TP in the sediments of inflow rivers located in the II-03 and III-11 aquatic ecological function zones. The removal of TN from the inflow rivers located in III-12 and III-13 should be emphasized. Considering the heterogeneity and stress factors, this study suggests protection and restoration measures tailored to local conditions to effectively improve the water ecological security of Taihu Lake Basin.

Key words: Taihu Lake, aquatic ecological function zoning, PSS model, aquatic ecological security, evaluate, countermeasures and suggestions

摘要：

太湖流域水生态安全在维持长江流域生态安全格局中发挥重要作用。为阐明不同生态功能影响下太湖流域分区水生态安全状况，将太湖流域水生态功能分区与不同区域主导生态功能定位结合，构建基于主导生态功能定位的“压力-状态-服务”（PSS）模型并开展分区评估。结果表明，太湖流域整体生态安全形势为“较安全”和“基本安全”。太湖湖体生境状态因素最差，水质净化区、水源涵养区、水环境维持区和重要生境维持区的生境压力及生境状态为主要制约因素。太湖湖体II-08、II-10和III-20水生态功能分区处于“不安全”水平，入湖河流污染负荷汇入影响突出。水环境维持区和重要生境维持区均受人类活动扰动影响较大。根据湖体与入湖河道水体、底泥氮磷浓度相关性研究结果，II-03、III-11、III-12水生态功能分区水质与III-20区域氮磷浓度关系密切，与总氮、总磷相关性显著（P>0.05）的入湖河道占比分别为50%、66.7%，应兼顾氮磷输入影响。III-13和浙江省分别有100%、71.4%的入湖河道的TP浓度与湖体TP浓度相关性显著（P>0.05），应重点把控总磷输入风险，湖体总磷外源污染输入风险更大。入湖河道底泥中氮磷浓度较高，沉积物再悬浮导致N、P等污染物向上覆水释放并随之汇入太湖，影响太湖水生态安全。应重点关注II-03、III-11水生态功能分区入湖河道底泥N、P治理，重点强化III-12、III-13入湖河道TN去除。针对太湖湖体及环湖水生态功能分区生态安全异质性胁迫因素，因地制宜开展保护修复，推动太湖流域水生态安全有效提升。

关键词: 太湖, 水生态功能分区, PSS模型, 水生态安全, 评估, 对策建议

CLC Number:

X824
X826

LING Hong, ZHU Xiaoxiao, WU Dan, SU Xiaomei, GUO Xiya. Assessing Water Ecological Security in the Taihu Lake Basin through Ecological Function Localization[J]. Ecology and Environment, 2024, 33(3): 418-427.

凌虹, 朱晓晓, 巫丹, 苏小妹, 郭西亚. 基于生态功能定位的太湖流域水生态安全评估[J]. 生态环境学报, 2024, 33(3): 418-427.

Figures/Tables 10

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指标体系			单位	参照标准					权重
目标层	因素层	指标层	单位	A ¹⁾	B ²⁾	C ³⁾	D ⁴⁾	E ⁵⁾	A	B	C	D	E
太湖生态安全综合指数 (ESI)	生境压力 A₁	污染负荷指数B₁₁	－ ⁶⁾	× ⁷⁾	1	1	1	1	×	0.5	0.5	0.5	0.5
		人类活动强度指数B₁₂	－	×	0.13	0.08	0.16	0.17	×	0.5	0.5	0.5	0.5
		入湖河流污染负荷指数B₁₃	－	1	×	×	×	×	0.4	×	×	×	×
		换水周期B₁₄	d	192 ⁸⁾	×	×	×	×	0.3	×	×	×	×
		水生生境干扰指数B₁₅	－	100	×	×	×	×	0.3	×	×	×	×
	生境状态 A₂	水质综合达标率B₂₁	%	100	100	100	100	100	0.2	0.2	0.2	0.2	0.2
		底栖动物多样性指数B₂₂	－	3	3	3	3	3	0.1	0.2	0.2	0.2	0.2
		沉积物营养物质污染指数B₂₃	－	1	1	1	1	1	0.1	0.2	0.2	0.2	0.2
		浮游植物多样性指数B₂₄	－	3	×	3	×	×	0.1	×	0.2	×	×
		沉积物重金属生态风险指数B₂₅	－	150	150	×	150	150	0.1	0.2		0.2	0.2
		综合营养状态指数B₂₆	－	50	×	50	×	×	0.1	×	0.2	×	×
		河流水质指数B₂₇	－	×	1	×	1	1	×	0.2	×	0.2	0.2
		年平均水位B₂₈	m	3.31	×	×	×	×	0.1	×	×	×	×
		蓝藻水华发生面积B₂₉	km²	62	×	×	×	×	0.1	×	×	×	×
		浮游动物多样性指数B₂₁₀	－	3	×	×	×	×	0.1	×	×	×	×
	服务功能 A₃	自然保护区级别B₃₁	分	×	×	5	×	5	×	×	0.25	×	0.5
		区域水面率B₃₂	%	×	×	×	8.6	×	×	×	×	0.5	×
		湿地面积的比例B₃₃	%	×	11.6	2.68	×	×	×	0.5	0.25	×	×
		年引水量与供水量之比B₃₄	－	0.63	×	×	×	×	0.25	×	×	×	×
		微囊藻毒素浓度达标率B₃₅	%	100	×	×	×	×	0.25	×	×	×	×
		集中饮用水水质综合达标率B₃₆	%	100	×	×	×	×	0.25	×	×	×	×
		水生植被覆盖率B₃₇	%	30	×	×	×	×	0.25	×	×	×	×
		林草覆盖率B₃₈	%	×	13.3	48.6	1.62	×	×	0.5	0.25	0.5	×
		水源涵养指数B₃₉	－	×	×	54.2	×	×	×	×	0.25	×	×
		保护区面积的比例B₃₁₀	－	×	×	×	×	0.38	×	×	×	×	0.5

指标体系			单位	参照标准					权重
目标层	因素层	指标层	单位	A ¹⁾	B ²⁾	C ³⁾	D ⁴⁾	E ⁵⁾	A	B	C	D	E
太湖生态安全综合指数 (ESI)	生境压力 A₁	污染负荷指数B₁₁	－ ⁶⁾	× ⁷⁾	1	1	1	1	×	0.5	0.5	0.5	0.5
		人类活动强度指数B₁₂	－	×	0.13	0.08	0.16	0.17	×	0.5	0.5	0.5	0.5
		入湖河流污染负荷指数B₁₃	－	1	×	×	×	×	0.4	×	×	×	×
		换水周期B₁₄	d	192 ⁸⁾	×	×	×	×	0.3	×	×	×	×
		水生生境干扰指数B₁₅	－	100	×	×	×	×	0.3	×	×	×	×
	生境状态 A₂	水质综合达标率B₂₁	%	100	100	100	100	100	0.2	0.2	0.2	0.2	0.2
		底栖动物多样性指数B₂₂	－	3	3	3	3	3	0.1	0.2	0.2	0.2	0.2
		沉积物营养物质污染指数B₂₃	－	1	1	1	1	1	0.1	0.2	0.2	0.2	0.2
		浮游植物多样性指数B₂₄	－	3	×	3	×	×	0.1	×	0.2	×	×
		沉积物重金属生态风险指数B₂₅	－	150	150	×	150	150	0.1	0.2		0.2	0.2
		综合营养状态指数B₂₆	－	50	×	50	×	×	0.1	×	0.2	×	×
		河流水质指数B₂₇	－	×	1	×	1	1	×	0.2	×	0.2	0.2
		年平均水位B₂₈	m	3.31	×	×	×	×	0.1	×	×	×	×
		蓝藻水华发生面积B₂₉	km²	62	×	×	×	×	0.1	×	×	×	×
		浮游动物多样性指数B₂₁₀	－	3	×	×	×	×	0.1	×	×	×	×
	服务功能 A₃	自然保护区级别B₃₁	分	×	×	5	×	5	×	×	0.25	×	0.5
		区域水面率B₃₂	%	×	×	×	8.6	×	×	×	×	0.5	×
		湿地面积的比例B₃₃	%	×	11.6	2.68	×	×	×	0.5	0.25	×	×
		年引水量与供水量之比B₃₄	－	0.63	×	×	×	×	0.25	×	×	×	×
		微囊藻毒素浓度达标率B₃₅	%	100	×	×	×	×	0.25	×	×	×	×
		集中饮用水水质综合达标率B₃₆	%	100	×	×	×	×	0.25	×	×	×	×
		水生植被覆盖率B₃₇	%	30	×	×	×	×	0.25	×	×	×	×
		林草覆盖率B₃₈	%	×	13.3	48.6	1.62	×	×	0.5	0.25	0.5	×
		水源涵养指数B₃₉	－	×	×	54.2	×	×	×	×	0.25	×	×
		保护区面积的比例B₃₁₀	－	×	×	×	×	0.38	×	×	×	×	0.5

分区	建设用地与农用地比例		增幅/%
分区	1990年	2018年	增幅/%
水质净化区	0.13	0.59	354
水环境维持区	0.16	0.84	425
水源涵养区	0.08	0.28	250
重要生境维持区	0.17	1.53	800

分区	建设用地与农用地比例		增幅/%
分区	1990年	2018年	增幅/%
水质净化区	0.13	0.59	354
水环境维持区	0.16	0.84	425
水源涵养区	0.08	0.28	250
重要生境维持区	0.17	1.53	800

区域	因素层	指标	ESI
区域	因素层	指标	Pearson 相关性	显著性 (双侧)
太湖湖体	生境压力	入湖河流污染负荷指数	0.931*¹⁾	0.022
	生境状态	水质综合达标率	0.748	0.146
		综合营养状态指数	0.858	0.063
		沉积物营养物质污染指数	0.481	0.413
		沉积物重金属生态风险指数	−0.054	0.931
		浮游植物多样性指数	0.347	0.567
		浮游动物多样性指数	0.379	0.530
		底栖动物多样性指数	0.205	0.740
水环境维持区	生境压力	人类活动强度指数	0.793** ²⁾	0.006
	生境压力	污染负荷指数	−0.225	0.533
	生境状态	水质综合达标率	0.060	0.869
		河流水质指数	0.015	0.966
		沉积物营养物质污染指数	0.153	0.672
		沉积物重金属生态风险指数	0.171	0.636
		底栖动物多样性指数	0.335	0.343
	服务功能	区域水面率	0.600	0.067
	服务功能	林草覆盖率	0.479	0.161

Assessing Water Ecological Security in the Taihu Lake Basin through Ecological Function Localization

基于生态功能定位的太湖流域水生态安全评估

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分区	COD_Mn/ (mg∙L⁻¹)	COD_Cr/ (mg∙L⁻¹)	TN/ (mg∙L⁻¹)	NH₃-N/ (mg∙L⁻¹)	TP/ (mg∙L⁻¹)
Ⅰ-05	3.58	10.9	1.16	0.062	0.067
Ⅱ-08	4.97	15.6	2.01	0.083	0.133
Ⅱ-09	4.52	14.5	1.72	0.058	0.125
Ⅱ-10	4.73	15.2	1.97	0.098	0.139
Ⅲ-20	6.56	20.0	3.40	0.305	0.280

入湖河道所在功能区	入湖河道	太湖湖体Ⅱ-08		入湖河道所在功能区	入湖河道	太湖湖体Ⅱ-10		入湖河道所在功能区	入湖河道	太湖湖体Ⅲ-20
入湖河道所在功能区	入湖河道	Pearson 相关性	显著性 (双侧)	入湖河道所在功能区	入湖河道	Pearson 相关性	显著性 (双侧)	入湖河道所在功能区	入湖河道	Pearson 相关性	显著性 (双侧)
III-13	望虞河	−0.256	0.423	浙江省	夹浦港	0.224	0.483	III-12	太滆运河	0.513	0.088
	望虞河	−0.256	0.423		夹浦港	0.224	0.483		武进港	0.198	0.537
	梁溪河	0.711**²⁾	0.01		合溪新港	0.569	0.054		直湖港	0.446	0.146
	梁溪河	0.711**²⁾	0.01		合溪新港	0.569	0.054		陈东港	0.700*¹⁾	0.011
	小溪港	0.199	0.535		长兴港	0.756**	0.004	III-11	漕桥河	0.673*	0.016
III-12	太滆运河	0.429	0.164		杨家浦港	0.249	0.436		殷村港	0.477	0.117
	太滆运河	0.429	0.164		杨家浦港	0.249	0.436		大浦港	0.798**	0.002
	武进港	0.216	0.5		旄儿港	0.602*	0.038		官渎港	0.700*	0.011
	武进港	0.216	0.5		旄儿港	0.602*	0.038		洪巷港	0.608*	0.036
	直湖港	0.385	0.216		东苕溪	0.376	0.228		社渎港	0.447	0.145
	直湖港	0.385	0.216		东苕溪	0.376	0.228	II-03	乌溪港	0.759**	0.004
	陈东港	0.480	0.114		大钱港	0.408	0.187	II-03	大港河	0.128	0.691

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